Pencil-sharpener.



No. 756,287. PATENTED APR. 5, 1904.

P. M. ROBINSON.

H0 MODEL.

15/ Z Z ,m z,

A may Patented April 5, 1904.

FRANK M. ROBINSON, OF ALLENTOWN, PENNSYLVANIA.

PENClL-SHARF'ENER.

SPECIFICATION forming part of Letters Patent No. 756,287, dated April 5, 1904. 7 Application filed December 8, 1903. Serial No. 184,321. No model.)

To aZZ whom it may concern:

Be it known that I, FRANK M. ROBINSON, a citizen of the United States, residing at Allentown, in the county of Lehigh, State of Pennsylvania, have invented certain new and useful Improvements in Pencil-Sharpeners, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a pencil-sharpener, and particularly to a construction for impartinglgi a planetary movement to the sharpeningro s.

The invention has for an object to provide a construction whereby the sharpening-rolls may be mounted at their opposite ends in rotatable disks, one of which is driven, while each of the rolls is provided with a gear adapted to mesh with a fixed series of gear-teeth whereby the rolls are individually rotated about their axes and also about the axes of the supporting plates at the opposite ends thereof.

A further object of the invention is to provide an improved construction of the detail features of the sharpener whereby the construction thereof may be simplified and economized, while a most eflicient action is secured in the operation thereof.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof definedby the appended claims.

In the drawings, Figure 1 is a perspective. Fig. 2 is acentral vertical section. Fig. 3 is a detail perspective of the driving-disk. Fig. 4 is a similar view of the internal gear. Fig. 5 is a perspective of the sharpening-rollers, ancLFig. 6 is a similar view of the supportingc 1s Like letters of reference refer to like parts in the several figures of the drawings.

The device may be mounted upon any suitable form of frame and standard, one form of which is herein shown, where theletter Adesignates a standard having a foot A at its lower end, adapted to be secured to a fixed support, while at the upper portion thereof a back plate A is secured. Supported from this back plate is a front plate A connected in any desired manner-for instance, by the side bars Awhile the front plate is provided with a tubular pencil-holder A extended through the plate at its inner face, as shown at A. Supported from the back plate A is an internal gear-plate B, which may be held in position by means of posts or screws B and is provided with a centrally-disposed aperture B having a series of peripheral gear-teeth B The driving-disk C is disposed parallel to the gear-plate B and adjacent to the back plate A and journaled therein by means of the spindle O, upon the end of which the driving-pinion C is secured, which pinion is adapted to mesh with the driving-gear O pivotally mounted upon the standard at O and provided with an operating-handle O. This drivingdisk is provided with bearing-sockets O upon its inner face adapted to receive the pintles I) at one end of the grinding-rollers D, which are mounted at an angle to each other, and upon the same end of which the gear D is also provided and adapted to engage the teeth B of the internal gear-plate. These rollers may be of any desired constructionfor instance, formed of wood or equivalent material and coated with emery for the purpose of forming an abrading-surface to engage the pencil inserted between the same. The opposite ends 'of these rollers are provided with pintles D adapted to seat in sockets E, formed in the rotatable supporting-disk E, which is provided with a central aperture E adapted to fit over the extended end A": of the pencilholder and rotate thereon.

In the operation of the invention it will be seen that power transmitted from the driving-wheel will through the geared connection readily rotate the driving disk and carry therewith the grinding-rollers and the supporting-disk at the opposite end thereof, rotating the same about the axes of said disks. During this rotative movement the gears upon the ends of the rollers engage the teeth of the internal gear-plate, thus rotating the rollers upon their own axes simultaneously with the first rotation, thereby providing a planetary motion for the cutters,which has been found especially efficient in this art. The construction herein shown has been found to be adapted to grind the Wood at the pencil-point with out danger to the lead therein, and the construction of the several parts is such that they may be simply and economically formed by machinery and assembled without the use of skilled labor. Furthermore, the construction permits the use of a desirable extended grinding-surface and firmly supports the rollers during the planetary movement thereof.

It Will be obvious that changes may be made in the details of construction and configuration Without departing from the spirit of the invention as defined by the appended claims.

Having described my invention and set forth its merits, What I claim, and desire to secure by Letters Patent, is p 1. In apencil-sharpener, a frame, a drivingdisk mounted therein, rollers pivotally mounted at one end in said disk, a supporting-disk rotatably mounted upon said frame for pivotally mounting the opposite ends of the rollers, and means for rotating said driving-disk.

2. In a pencil-sharpener, a frame, a drivingdisk mounted therein, rollers pivotally mounted at one end in said disk, a supportin disk rotatably mounted upon said frame for pivotally mounting the opposite ends of the rollers, means for rotating said driving-disk, gears upon said rollers, and a fixed internal gear spaced from the frame parallel to the drivingdisk for engaging said roller-gears. v

3. In a pencil-sharpener, a frame, adrivingdisk mounted therein, rollers pivotally mounted at one end in said disk, a rotatable supporting-disk for pivotally mounting the opposite ends of the rollers, means for rotating said driving-disk, gears upon said rollers, an internal gear engaging said roller-gears, and a pencil-holder carried by the frame to pro- Vide a bearing for the supporting-disk.

4. In a pencil-sharpener, astandard, aframe comprising front and back plates connected together, a driving-disk pivotally supported in the back plate, a supporting-disk pivotally supported upon the front plate, and rollers having their pintles mounted in said disks and disposed With their operating-faces at an angle to each other.-

5. In apencilsharpener, astandard, aframe comprising front and back plates connected together, a driving-disk pivotally supported in the back plate, a supporting-disk pivotally supported upon the front plate, rollers having their pintles mounted on said disks and disposed With their operating-faces at an angle to each other, an internal gear-plate rigidly supported from the back plate, and gears carried by each of said rollers to engage the internal gear-plate.

6. Inapencil-sharpener, astandard, aframe comprising front and back plates connected together, a driving-disk pivotally supported in the back plate, a supporting-disk pivotally supported upon the front plate, rollers having their pintles mounted in said disks and disposed With their operating-faces at an angle to each other, an internal gear-plate rigidly supported from the back plate, gears carried by each of said rollers to engage the internal gear-plate, and a pencil-holder projected from the front plate and extended beyond the inner face thereof to form a bearing for the supporting-disk.

7 In apencil-sharpener, astandard, aframe comprising front and back plates connected together, a driving-disk pivotally supported in the back plate, a supporting-disk pivotally supported upon the frame, rollers having their pintles mounted in said disks and disposed With their operating-faces at an angle to each other, an internal gear-plate rigidly supported from the back plate, gears carried by each of said rollers to engage the internal gearplate, a pencil-holder projected from the front plate and extended beyond the inner face thereof to form a bearing for the supportingdisk, a pinion upon the shaft of the drivingdisk, and a drivinggear pivotally mounted upon an upright to mesh With said pinion.

In testimony whereof I aflix my signature in presence of tWoWitnesses.

FRANK M. ROBINSON. 

